Dynamo-electric machine.



A. KINGSBURYJ DYNAMO ELECTRIC MACHINE. APPLICATION TILED MAR. 4, 1907.

Patented Jan. 31, 1911.

2 SHEETSPSBIIVIET 1:

7 9 ITNESSES'.

INVENTQR 94W AfiURNEYS A. KINGSBURY.

DYNAMU EL BGTRIG MACHINE. APPLICATION FILED HA3. 4, 1907.

Patented Janis-L 1m.

2 SHEETS-SHEET 2.

with a forced t the stationary and rotating membersfby means of apropeller attached to the shaft UNITED, STATES PA ()FFIGE.

ALBERT KINGSBURY, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR T0 WESTINGHOUSEELECTRIC & MANUFACTURING COMPANY, A CORPORA'IIGN OF PENNSYLVANIA.

DYNAMO-ELEOTRIC MACHINE.

Specification of Letters I'atcnt.

Patented Jan. 31., 1911.

application filed March 4, 19072 Serial No. 360,511.

To all whom it may concern:

Be it known that I, ALBERT Knvesnnnr, a citizen of the United'States,and a resident of Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement inI)ynamo-Electric Machines,'of which the following is a specification Myinvention relates to dynamoelectric machines, and has special referenceto maehinee having rotary field magnets that are adapted. to operaterelatively high speeds.

. The object of my invention is to provide improved means for propellingcool air, or other ventilating fluid, through the magnetizalole coremembers and the windings of dynamo-electric machines in conjunction withmeans for so directing the fluid thus circulated to enable the windingsof the machine to carry relatively large currents continuously Withoutexcessive heating,

Steam turbine driven generators and other high speed machines are oftenentirely inclosed by stationary frames to which end bells are attachedinorder to avoid the noise which would otherwise result from the rushingof the atmosphere through openings in these parts when the machines arein operation. In a structure of this kind, the circulation of air isestablished from the outside atmosphere into an outer compartmentin theend bell (which is usually provided iartition), from which point it ishrough the air gap, formed between and comprising radial vanes locatedsubstantially in the plane of the partition. Consequently, the airpassesfrom the outer to the inner compartment of the end bell near the shaft.2 i

It is a Well known factthat, in any machine of the stationary armaturetype, the so-called end connecting portions of the Winding, which areoutside the core slots, are raisedto higher temperatures by the passageof current through the windings than are. other portions of thestructure by reason of the fact that a large number of conductors arehere grouped together and are surrounded by air, which a relatively poorheat conductor. The quantity of heat generated at this point is,however, not excessive and, in order that the temperature of these partsmay bekept normal, I pro- I vide, according to niy present invention,means forfirst directing the cool outside atmosphere through the endconnecting portions of the winding and, afterward, this relatively largebody of air which is raised in temperature only slightly, is forcedthrough the core structures and windings of the rotating and stationaryparts before it is permitted to escape through. suitablechan providedfor that purpose Figure. l of the accompanying drawing is a partiallysectional elevation, in a longitw dinal plane, or a dynanidelectric.lnachine constructed in accordance with my invenpartinents of a singleend bell being shown indicative of the arrangement which may be utilizedin practice at each end of the machine, and Fig, 9 an end elevation ofa. portion of the machine shown in Fig. 1.

Referring to the drawings, the dynamoelectric machine illustratedcomprises a stationary core member 1 which is supported by a frame 2, arotatable core member 2) mounted on a shaft.- l, end. bells 5 and. (3attached to the stationary trainee and air propelling devices 7. Theetationary core member 1 is connecting portions 9 and parallel straightportions 10, the latter being located in the core slots 11 in a wellknown manner.

The stationary frame and the end bells form an. iuclosing casing forthe. machine comprising a middle chamber .3? which contains thestationary and movable core members and a pair of end chambers 23 thatare separated i'rtun the middle chamber by partitions 21 (only one ofwhich is shown), and

tributed through the active parts of the machine.

cap or'bell 12 which is attached to and is of 1nuteriall v greaterdianietcr than the rotating member 3 so that it covers the air-gap 13which exists between the stationary and rotating memlurs, its outer edgebeing in close proximity to the inner surface of the armature core. Thecup 152 is further pro vided with radial vanes 14 which may be integralwith it, and which force the air into the airegap 13 when themachine isin operation. an annular opening 15 being provided adjacent to the shaftthrough which air is received from compartments 16 of the end tion, theail propelling device and the coniprovided with armature coils 8 havingend receive the cool air which is afterward die Each of the airpropellers T comprises a propeller 19 that comprises a relatively,

' small bell attached to and located within the bell 1.2 and providedwith propelling vanes 20.

The compartments 16 are located between the ends of the core members andthe partitions 21, the latter being supported by radial ribs 22 andbeing of such shape and size as to provide ample passages between theend chambers and the middle chamber 27 near the top and sides of the endbells 5 and 6.

The operation of the ventilating system is as follows: Fresh, cool airis taken in at the lower edges of the end bells (usually from below thefloor of the power house) through ports 28 and 29 into both the endchambers 23 and the compartments 16 of the end bells 5 and 6, and passesdirectly over the endconnecting portions 9 of the armature coils. Theair then enters the caps which form parts of the propelling devices 7,near the shaft 4:, and is forced, by means of the vanes 14, into theair-gap 13 so that it circulates through ventilating ducts 24 in thestationary core'member. A portion of the air which enters the bell 12 ofthe propelling device is forced through the longitudinal holes 17 in therotating core member and passes therefrom through the ventilating ducts18. The air is finally exhausted through ports 26 in annularcompartments 25 which are provided between the stationary core structureand the outermost wall of the supporting frame 2 and form parts of theinner chamber 27. The exhaust ports 26 I preferably communicate with theoutside air at a point considerably removed from the intake ports, finesor other suitable means (not shown) being connected to either the inletports or to the exhaust ports.

Itwill be understood that various structural modifications may-beeffected Within the scope of my invention, and I, therefore, desire thatonly such limitations shall be imposed as; are indicated in the appendedclaims.

I claim as my invention: 4 I l/A dynamo-electric machine provided withamiddle chamber having one or more side exhaust ports and containingarmature and field magnets, an end chamber communicating with saidmiddle chamber, inlet ports at one side of the end chamber andsimilar'in'let ports for the middle chamber adjacent to those of the endchamber.

2. A- dynamo-electric machine provided with a middle chamber having oneor more exhaust ports and containing armature and' field magnets, an endchamber communicatmember and having exhaust ports communicatingtherewith, of side-by-side end compartments in open communication witheach other near their outer peripheral Walls and having inlet ports, andmeans for directing currents of air from said end compartments into saidair-gap and into said ventilating passages.

4. In a dynamo-electric machine, the combination with a stationarymember having outside circumferential compartments, trans verseventilating passages and one or more exhaustports that communicate withsaid compartments, of a rotatable member separated from said stationarymember by an air gap and provided with communicating longitudinal andtransverse ventilating pas-.

sages, of side-byside endcompartments in open communication with'eachother near their outer peripheral walls and having adjacent inlet ports,and means for establishmg a circulation of air from said endcompartments into and through said air gap and all of said passages.

5. In a dynamo-electric machine, the combination with stationary membersprovided with transverse ventilating passages and a rotatable ,member'provided with'longitudi nal and transverse ventilating passages, saidmembers being separated by a material air gap, of a cap'or end bellattached to the rotatable member and provided with an annular openingnear its center and with radial vanes for forcing air into said air gap,and an auxiliary cap or hell forforcing air into the longitudinalpassagesjn said rotatable member.

6. In adynamoelectric machine, the combination with stationary androtatable core "members separated by a'material air gap,

the. latter being provided with longitudinal and transversecommunicating passages, and

a supporting shaft for the rotatable mem- 'ber, of amend-bell attachedto the end of the rotatablemember and provided with inwardly projbotidial vanes for forcing air' into said air) m1 an auxiliary means forforcing air 1 r r the longitudinal passages 1n said-men er.

7 In a dynamo-electric. machine, the comto the end of the rotatablemember and comprising an inner auxiliary bell having inwardly projectingvanes and an outer, bell-shaped member having inwardly projecting vanesthe outside diameter of the main bell being greater than that of therotatable member.

In testimony whereof, I have hereunto subscribed my name this 27th dayof February, 1907. r

' ALBERT KINGSBURY. Witnesses: I

JENS BAoHE-WVfiG, 4 BIRNEY HINEs.

